Enum Gesture 

#[non_exhaustive]
pub enum Gesture {
    WrapRange(InlineKind),
    ToggleInline(InlineKind),
    SetBlock,
    ToggleBlockContainer(BlockContainerKind),
    InsertThematicBreak,
    ToggleCodeBlock,
    SetCodeLanguage,
    ToggleTaskItem,
    SetTaskChecked,
    ToggleTaskChecked,
    InsertLink,
    InsertImage,
    InsertFootnote,
    InsertLiteral,
    InsertLineBreak,
    SplitBlock,
    RenumberOrderedLists,
    TableInsertRow,
    TableDeleteRow,
    TableInsertColumn,
    TableDeleteColumn,
    TableSetAlignment,
    TableMoveRow,
    TableMoveColumn,
}

One authoring gesture, named with whatever kind it takes — the question Format::supports answers.

Twig’s formats are ragged: Djot spells all eight inline marks and Markdown three, HTML spells marks and nothing block-level, AsciiDoc spells everything but links, footnotes and tables, XML nothing. Every Editor method already reports that as Error::UnsupportedFormat — but only once called, which is too late for a UI that wants to disable the button rather than let it fail.

A variant carries a kind exactly where the Editor method takes one, so the query is spelled with the same value as the call:

if Format::Markdown.supports(Gesture::ToggleInline(InlineKind::Mark)) {
    // never runs: `==mark==` is emit-only in Markdown.
}

Only the gestures with a format-level gate appear — which, since the last nine were added, is every gesture the editor has. Those nine read no format spelling at all until an HTML document showed what that cost:

• The Table* variants. HTML’s parser lowers <table>/<tr>/<td> to the same nodes a pipe table produces, so Editor::table_insert_row and its siblings extracted the grid and wrote pipe text over the elements. HTML reparses that as a paragraph — a document that still parses, so nothing rolled it back and no error was returned. The table was simply gone.
• Gesture::SplitBlock. The blank line it writes means “two blocks” only where blank lines separate blocks; inside a <p> it is whitespace, so Editor::split_block reported success over an unchanged document.
• Gesture::RenumberOrderedLists. A textual N. rewrite finds nothing in an <ol>, whose numbering is in the tag, and called the no-op a success.

#[non_exhaustive] for the reason Format is: the gesture list grows with the editor surface, and a caller matching on this should not need a rebuild.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

WrapRange(InlineKind)

ToggleInline(InlineKind)

SetBlock

ToggleBlockContainer(BlockContainerKind)

InsertThematicBreak

ToggleCodeBlock

SetCodeLanguage

ToggleTaskItem

SetTaskChecked

ToggleTaskChecked

InsertLink

InsertImage

InsertFootnote

InsertLiteral

InsertLineBreak

SplitBlock

RenumberOrderedLists

TableInsertRow

TableDeleteRow

TableInsertColumn

TableDeleteColumn

TableSetAlignment

TableMoveRow

TableMoveColumn

Trait Implementations

impl Clone for Gesture

fn clone(&self) -> Gesture

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Gesture

impl Debug for Gesture

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Gesture

impl PartialEq for Gesture

fn eq(&self, other: &Gesture) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Gesture